mirror of
https://github.com/torvalds/linux
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98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
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/*
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* Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* This is the interface to the remote debugger stub.
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*/
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#include <asm/io.h>
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#include <asm/mips-boards/atlas.h>
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#include <asm/mips-boards/saa9730_uart.h>
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#define INB(a) inb((unsigned long)a)
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#define OUTB(x,a) outb(x,(unsigned long)a)
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/*
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* This is the interface to the remote debugger stub
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* if the Philips part is used for the debug port,
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* called from the platform setup code.
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*/
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void *saa9730_base = (void *)ATLAS_SAA9730_REG;
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static int saa9730_kgdb_active = 0;
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#define SAA9730_BAUDCLOCK(baud) (((ATLAS_SAA9730_BAUDCLOCK/(baud))/16)-1)
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int saa9730_kgdb_hook(int speed)
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{
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int baudclock;
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t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
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/*
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* Clear all interrupts
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*/
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(void) INB(&kgdb_uart->Lsr);
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(void) INB(&kgdb_uart->Msr);
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(void) INB(&kgdb_uart->Thr_Rbr);
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(void) INB(&kgdb_uart->Iir_Fcr);
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/*
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* Now, initialize the UART
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*/
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/* 8 data bits, one stop bit, no parity */
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OUTB(SAA9730_LCR_DATA8, &kgdb_uart->Lcr);
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baudclock = SAA9730_BAUDCLOCK(speed);
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OUTB((baudclock >> 16) & 0xff, &kgdb_uart->BaudDivMsb);
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OUTB( baudclock & 0xff, &kgdb_uart->BaudDivLsb);
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/* Set RTS/DTR active */
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OUTB(SAA9730_MCR_DTR | SAA9730_MCR_RTS, &kgdb_uart->Mcr);
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saa9730_kgdb_active = 1;
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return speed;
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}
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int saa9730_putDebugChar(char c)
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{
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t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
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if (!saa9730_kgdb_active) { /* need to init device first */
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return 0;
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}
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while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_THRE))
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;
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OUTB(c, &kgdb_uart->Thr_Rbr);
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return 1;
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}
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char saa9730_getDebugChar(void)
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{
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t_uart_saa9730_regmap *kgdb_uart = (t_uart_saa9730_regmap *)(saa9730_base + SAA9730_UART_REGS_ADDR);
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char c;
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if (!saa9730_kgdb_active) { /* need to init device first */
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return 0;
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}
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while (!(INB(&kgdb_uart->Lsr) & SAA9730_LSR_DR))
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;
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c = INB(&kgdb_uart->Thr_Rbr);
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return(c);
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}
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